864081643 has 2 divisors, whose sum is σ = 864081644. Its totient is φ = 864081642.

The previous prime is 864081637. The next prime is 864081649. The reversal of 864081643 is 346180468.

It is a balanced prime because it is at equal distance from previous prime (864081637) and next prime (864081649).

It is a cyclic number.

It is not a de Polignac number, because 864081643 - 2⁵ = 864081611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 864081596 and 864081605.

It is not a weakly prime, because it can be changed into another prime (864081649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432040821 + 432040822.

It is an arithmetic number, because the mean of its divisors is an integer number (432040822).

Almost surely, 2^864081643 is an apocalyptic number.

864081643 is a deficient number, since it is larger than the sum of its proper divisors (1).

864081643 is an equidigital number, since it uses as much as digits as its factorization.

864081643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 864081643 is about 29395.2656562243. The cubic root of 864081643 is about 952.4706302786.

The spelling of 864081643 in words is "eight hundred sixty-four million, eighty-one thousand, six hundred forty-three".